Stick Insect

While most creatures require a certain background to be successful, some are so well camouflaged that they may be detected practically everywhere. Stick insects, for example, have twig-like bodies that allow them to become nearly invisible just by remaining motionless.

Stick insects are found all throughout the world and range in size from one to twelve inches. They are usually brown or green in color and freeze when threatened, swinging to simulate a limb blowing in the wind. That isn't to suggest they can't assert themselves. To ward off would-be predators, the American stick insect, for example, can spray a weak acid from two glands in its thorax. It can burn and possibly cause temporary blindness if it goes into a person's eyes.

Scientific Name: Phasmatodea
Distribution: Found on all continents except Antarctica
Size: 0.6 inches to 25 inches